On-line testing device for high temperature and high pressure rock physical property and percolation mechanism nuclear magnetic resonance

Abstract

The invention relates to an on-line testing device for high temperature and high pressure rock physical property and percolation mechanism nuclear magnetic resonance. The on-line testing device comprises a nuclear magnetic resonance on-line testing module, a rock fluid displacement module (comprising core holder compatible with nuclear magnetic resonance tests) and a computer control and data processing module, a nuclear magnetic resonance testing system and a rock fluid displacement system are combined into a whole through computer control, formation temperature and pressure are simulated, rock displacement tests are carried out under high temperature and high pressure conditions, and real-time nuclear magnetic resonance signals are measured on line to obtain rich rock parameters (porosity, permeability, reservoir forming critical pressure, wettability and the like). The on-line testing device serves as a device for oil gas reservoir forming geological research and oil gas target assessment, and the purposes of analyzing core physical properties and percolation mechanism from micro perspective are achieved.

Description

technical field [0001] The invention relates to a device for geological research of deep low-permeability oil and gas accumulation in basins and oil and gas target evaluation, in particular to a nuclear magnetic resonance online testing device for high temperature and high pressure rock physical properties and seepage mechanism. technical background [0002] In recent years, nuclear magnetic resonance (NMR) has been widely used in reservoir pore structure, fluid saturation distribution and oil-gas seepage experimental research. According to the principle of relaxation and diffusion of fluid spin nuclear magnetic moments in rocks, this technology establishes the relationship between nuclear magnetic variables and rock- The calibration relationship of fluid information can be used to quantitatively detect the pore size and fluid distribution in the core online, and has the advantages of rapidity, repeatability and high precision. [0003] But so far there is no equipment for t...

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Problems solved by technology

[0003] But so far there is no equipment for the study of low-permeability reservoirs under high temperature and high pressure in deep basins, so the NMR observation method and technology suitable for the study of deep low-permeability rock structure and fluid seepage mechanism have been developed, and the physical properties and fluid properties of low-permeability rocks have been realized. Dynamic and non-destructive testing of various parameters such as saturation and saturation, can carry out simulation experiments of oil-gas-water multiphase fluid flow and displacement in various low-permeability media under high temperature and high pressure, and determine the dynamic process of oil-gas migration in deep low-permeability reservoirs , influencing factors and boundary conditions, and gradually form a quantitative evaluation technology for oil and gas migration and accumulation efficiency in low-permeability reservoirs, and effectively apply it to the prediction of oil and gas reservoir distribution in actual basins, providing strong technical support for deep and unconventional oil and gas exploration and development in basins

[0004] At present, most experiments involving nuclear magnetic resonance core analysis separate core displacement and nuclear magnetic resonance measurement signals, and few experiments can observe the distribution, migration and influence of various factors of oil, water and gas online

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